Which choice is appropriate simplified form and restriction for the variable (x+3)(x+7)/3x+21

a) 3/x+7 (x ≠ -7)

b) x+7/3 (x ≠ -7)

c) x+3/3 (x ≠ -7)

d) 3/x+3 (x ≠ -3)

and explain the answer too!

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?

Arectangular courtyard is 12 feet long and 8 feet wide. a tile is 2 feet long and 2 feet wide. how many tiles are needed to cover the courtyard?